Someone breaks a 52 cards deck in two parts. Itīs known to be in the left part of the deck three times more red cards than black ones. Which is the MINIMUM number of red cards to be removed from the right part of the deck to get three times more black cards than red ones there?

A 52-card deck in broken into two stacks.
The left stack has three times as many red cards than black cards.
What is the MINIMUM number of red cards to be removed from the right stack
to get three times as many black cards than red cards there?